\clearpage
\item \subquestionpoints{5}
Next, derive an expression for the variance of the distribution. In particular,
show that Var($Y\mid X;\theta$) can be expressed as the derivative of the mean
w.r.t $\eta$ (\emph{i.e.,} the second derivative of the log-partition
function $a(\eta)$ w.r.t the natural parameter $\eta$.)

\ifnum\solutions=1{
  \input{04-glm-convexity/02-var-sol}
}\fi
